If you are streaming at that time you may see your service cut off or you may just not be able to switch channels. Last time this happened anyone already streaming could continue watching their shows but found they could not change the channel.
Here is the message from the Sony website:
Affected Platforms:
PS4™ , PS3™ , Web , Other
Affected Services:
Routine maintenance and improvements for PlayStation™Network will be performed for approximately 0.5 hours on 08/28/2018, 11:00 AM to 08/28/2018, 12:30 AM (Eastern). Anyone who already has an account can still sign in to their PlayStation™Network profile, play games, and use most applications while this maintenance is carried out. You will not be able to access PlayStation Video, PlayStation Store, PlayStation Music, Account Management, Gaming And Social, PlayStation Now, and PlayStation Vue during this maintenance. We apologize for any inconvenience. We recommend activating your PS4 as your primary console before maintenance begins so you can continue to play most games and use 3rd party services during maintenance. To activate your console, sign in to your PlayStation™Network profile and select [Settings] > [Account Management] > [Activate as Your Primary PS4] > [Activate]. You only need to do this once. We strive to ensure that PlayStation™Network services are available at all times, but occasionally we must take PlayStation™Network offline to perform essential maintenance and implement feature enhancements. We are working hard to reduce the duration of each maintenance.
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